Elevated RalA activity in the hippocampus of PI3Kγ knock-out mice lacking NMDAR-dependent long-term depression by Su-Eon Sim, Hye-Ryeon Lee, Jae-Ick Kim, Sun-Lim Choi, Joseph Bakes, Deok-Jin Jang, Kyungmin Lee, Kihoon Han, Eunjoon Kim, Bong-Kiun Kaang